Chairman mao's theory of the differentiation of the three worlds is a major contribution to Marxism-Leninism 

 - Peking  Foreign languages press  1977 
 - 79p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communism-China
<br/><br/><label>Dewey Class. No.: </label>GL P 335.4345